DESCRIPTION

r
opens the named file for reading. If the file is not in the native VIPS format
for your machine,
im_open(3)
automatically converts the file for you in memory. For some large files (eg.
TIFF) this may not be what you want: you should call the appropriate converter
yourself, and arrange for the conversion to take place on disc. See
im_tiff2vips(3),im_jpeg2vips(3),im_png2vips(3),im_magick2vips(3),
and
im_ppm2vips(3).

p
creates a "glue" descriptor you can use to join two image processing
operations together.

rw
opens the named file for reading and writing. This will only work for VIPS
files in a format native to your machine. It is only for paintbox-type
applications.

im_open_local(3)
is a convenience function which opens an image descriptor as
im_open(3), but makes it local to im, that is, when im is closed, the
descriptor created by im_open_local(3) will be closed too.

im_open_local(3)
is handy for saving you from adding many
im_close(3)
calls to
escape points. Example: find the total of an array of images.